Hi Kian
For effeciency, use one of the default cursors. https://developer.gnome.org/gdk3/stable/gdk3-Cursors.html If you want, you can try creating your own cursor with animation and using that. I got this working on my netbook which isn't a very high powered computer by todays standards and it works fine. I don't see it eating up cpu cycles. Give it a try and see if it works. Eric //gcc -Wall cursor1.c -o cursor1 `pkg-config gtk+-3.0 --cflags --libs` //Tested on Ubuntu16.04, GTK3.18. #include<gtk/gtk.h> static guint timeout_id=0; static GdkCursor *cursors[4]; static void initialize_cursors(GtkWidget *window, GdkPixbuf *pixbufs[]); static void start_cursor(GtkButton *button1, GtkWidget *da); static void stop_cursor(GtkButton *button2, GtkWidget *da); static gboolean update_cursor(GtkWidget *da); static GdkPixbuf* draw_cursor(gint section); int main(int argc, char *argv[]) { gtk_init(&argc, &argv); GtkWidget *window=gtk_window_new(GTK_WINDOW_TOPLEVEL); gtk_window_set_title(GTK_WINDOW(window), "Cursors"); gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER); gtk_window_set_default_size(GTK_WINDOW(window), 400, 400); g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL); //Pixbufs for the different cursors. GdkPixbuf *pixbuf1=draw_cursor(1); GdkPixbuf *pixbuf2=draw_cursor(2); GdkPixbuf *pixbuf3=draw_cursor(3); GdkPixbuf *pixbuf4=draw_cursor(4); GdkPixbuf *pixbufs[]={pixbuf1, pixbuf2, pixbuf3, pixbuf4}; g_signal_connect(window, "realize", G_CALLBACK(initialize_cursors), pixbufs); GtkWidget *button1=gtk_button_new_with_label("Start Cursor"); gtk_widget_set_hexpand(button1, TRUE); GtkWidget *button2=gtk_button_new_with_label("Stop Cursor"); gtk_widget_set_hexpand(button2, TRUE); //Display the cursor in a drawing area. GtkWidget *da=gtk_drawing_area_new(); gtk_widget_set_hexpand(da, TRUE); gtk_widget_set_vexpand(da, TRUE); g_signal_connect(button1, "clicked", G_CALLBACK(start_cursor), da); g_signal_connect(button2, "clicked", G_CALLBACK(stop_cursor), da); GtkWidget *grid=gtk_grid_new(); gtk_grid_attach(GTK_GRID(grid), button1, 0, 0, 1, 1); gtk_grid_attach(GTK_GRID(grid), button2, 1, 0, 1, 1); gtk_grid_attach(GTK_GRID(grid), da, 0, 1, 2, 1); gtk_container_add(GTK_CONTAINER(window), grid); gtk_widget_show_all(window); gtk_main(); g_object_unref(pixbuf1); g_object_unref(pixbuf2); g_object_unref(pixbuf3); g_object_unref(pixbuf4); g_object_unref(cursors[0]); g_object_unref(cursors[1]); g_object_unref(cursors[2]); g_object_unref(cursors[3]); return 0; } static void initialize_cursors(GtkWidget *window, GdkPixbuf *pixbufs[]) { GdkWindow *win=gtk_widget_get_window(window); GdkDisplay *display=gdk_window_get_display(win); GdkCursor *cursor1=gdk_cursor_new_from_pixbuf(display, pixbufs[0], 1, 32); GdkCursor *cursor2=gdk_cursor_new_from_pixbuf(display, pixbufs[1], 1, 32); GdkCursor *cursor3=gdk_cursor_new_from_pixbuf(display, pixbufs[2], 1, 32); GdkCursor *cursor4=gdk_cursor_new_from_pixbuf(display, pixbufs[3], 1, 32); cursors[0]=cursor1; cursors[1]=cursor2; cursors[2]=cursor3; cursors[3]=cursor4; } static void start_cursor(GtkButton *button1, GtkWidget *da) { if(timeout_id==0) { timeout_id=g_timeout_add(300, (GSourceFunc)update_cursor, da); } } static void stop_cursor(GtkButton *button2, GtkWidget *da) { if(timeout_id!=0) { g_source_remove(timeout_id); timeout_id=0; GdkWindow *win=gtk_widget_get_window(da); gdk_window_set_cursor(win, NULL); } } static gboolean update_cursor(GtkWidget *da) { static gint i=0; GdkWindow *win=gtk_widget_get_window(da); gdk_window_set_cursor(win, cursors[i]); if(i>2) i=0; else i++; return TRUE; } static GdkPixbuf* draw_cursor(gint section) { //Create a surface to draw on. cairo_surface_t *surface=cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 64, 64); cairo_t *cr=cairo_create(surface); //Paint the background transparent. cairo_set_source_rgba(cr, 1.0, 1.0, 1.0, 0.0); cairo_paint(cr); cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0); cairo_rectangle(cr, 0.0, 0.0, 64.0, 64.0); cairo_stroke(cr); //Draw from center cairo_translate(cr, 64.0/2.0, 64.0/2.0); cairo_set_source_rgba(cr, 0.0, 1.0, 1.0, 1.0); cairo_arc(cr, 0.0, 0.0, 20.0, 0.0, 2.0*G_PI); cairo_fill(cr); //Some pie wedges. if(section==1) { cairo_set_source_rgb(cr, 1.0, 0.0, 0.0); cairo_move_to(cr, 0.0, 0.0); cairo_line_to(cr, 20.0, 0.0); cairo_stroke_preserve(cr); cairo_arc(cr, 0.0, 0.0, 20.0, 0.0, G_PI/2.0); cairo_stroke_preserve(cr); cairo_close_path(cr); cairo_fill(cr); } else if(section==2) { cairo_set_source_rgb(cr, 0.0, 1.0, 0.0); cairo_move_to(cr, 0.0, 0.0); cairo_line_to(cr, 0.0, 20.0); cairo_stroke_preserve(cr); cairo_arc(cr, 0.0, 0.0, 20.0, G_PI/2.0, G_PI); cairo_stroke_preserve(cr); cairo_close_path(cr); cairo_fill(cr); } else if(section==3) { cairo_set_source_rgb (cr, 0.0, 0.0, 1.0); cairo_move_to(cr, 0.0, 0.0); cairo_line_to(cr, -20.0, 0.0); cairo_stroke_preserve(cr); cairo_arc(cr, 0.0, 0.0, 20.0, G_PI, 3.0*G_PI/2.0); cairo_stroke_preserve(cr); cairo_close_path(cr); cairo_fill(cr); } else { cairo_set_source_rgb (cr, 1.0, 0.0, 1.0); cairo_move_to(cr, 0.0, 0.0); cairo_line_to(cr, 0.0, -20.0); cairo_stroke_preserve(cr); cairo_arc(cr, 0.0, 0.0, 20.0, 3.0*G_PI/2.0, 2.0*G_PI); cairo_stroke_preserve(cr); cairo_close_path(cr); cairo_fill(cr); } GdkPixbuf *cursor_drawing=gdk_pixbuf_get_from_surface(surface, 0, 0, 64, 64); cairo_destroy(cr); cairo_surface_destroy(surface); return cursor_drawing; } _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
